Yeah, Black Unicron was a USA edition. The Japanese version of original Unicron had only superficial details different, the clear plastic wasn't smokey like the US one, the face had some extra black paint around the eyes (which looked a little silly... looked like mascara to me!). To my knowledge Dead End is the same wherever he was sold in the world.

Thats the "USA Edition" Black Unicron. It is the exact same toy released in Energon by Hasbro. There are no paint differences at all. The USA Edition is just the hasbro toy stuck in a Takara Micron Legend Unicron box.